Product DescriptionLime OUT Heavy-Duty Rust, Lime & Calcium Stain Remover easily dissolves the toughest hard water and rust stains. Made by the makers of Iron OUT, heavy-duty rust removal experts, this product is specially formulated to dissolve tough lime, calcium and rust stains, caused by hard water. The thick, fast acting, concentrated formula is great for use on vertical surfaces as it clings longer for maximum cleaning power. Lime OUT is septic safe and also safe for a variety of both indoor and outdoor applications. A family owned business that started in 1958, Summit Brands offers highly effective, sustainable, and innovative household cleaning products. Summit Brands began with the distribution of multi-purpose rust stain remover, Iron Out, and has since branched out to include a broader line of specialty cleaning products under the OUT, Glisten and Plink brands. As category leaders in many consumer segments, our goal is to provide high-quality cleaning products that fit the needs of the consumer with guaranteed results.From the ManufacturerLime Out is a heavy duty liquid that is specially formulated to quickly dissolve the toughest lime, rust and calcium deposits. Use Lime Out in the bath, kitchen or laundry area. It leaves toilets, sinks, tubes, tile, showers, chrome, fiberglass, stainless steel, pots, pans and tea kettles fresh and clean without scrubbing. A special thickener has been added to Lime Out to help it cling to vertical surfaces.